Aside from referrals and word of mouth, we advertise using TV, Radio, Yellowpages, door knob hangers, Thank you cards (referral cards), Postcards, outside sales reps and online. The top ROI (return on investment) have always been from postcards and our online efforts. We put a lot into our website and it now brings in well over 1k per month at a $20 cost. I am not sure of any other investment with that great of a return. You can checkout our site by the link in my signature.